Hey there!
Both questions have the same meaning, asking about the outcome or experience of an interview. However, there are some nuances to consider:
"How was the interview going?"
This question is typically asked during the interview or very soon after it has started. It is present continuous, implying the interview is still in progress or the person asking expects it to be currently ongoing.
"How did the interview go?"
This question is asked after the interview has been completed. It is in the past tense, which indicates that the interview is over and the person is inquiring about the overall experience or outcome.
In summary, while they aim to find out about the interview, the timing implied by each question is different.
Hope this helps!